Legends say this red sandstone monolith and the dozens of smaller boulders that surround it were once a coven of witches—before a Scottish wizard turned them all to stone.

This tidal island, a sacred site in early English Christianity, was the target of a notable Viking invasion.

This 13th century castle is chock full of ghosts and impossibly rare cows.

These remarkable cascades are the jewels of Upper Tees.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

This Georgian Gothic building was created to shelter and feed deer.

The sign at the garden gate reads: "These Plants Can Kill."

Aliens and monsters lurk inside this museum dedicated to one man's lifelong adoration of all things sci-fi.

Rare remnants of the brick-domed ovens birthed in the Durham coalfield during the Industrial Revolution.

For decades, a bottle factory dumped their waste into these waters—now it's considered the best sea glass beach in England.

An unusual stone chair can be found on the banks of the River Wear, not far from Durham Cathedral.

Hundreds of years ago, this lion-shaped door knocker could help a person accused of a crime find temporary safe haven in Durham Cathedral.

A once-beautiful retreat is now a crumbling ruin.

These courts are the only ones of their kind in the world, made for a unique ball game that dates back to the 1700s.

The former "holiday home" for monks at the Durham Cathedral.

The largest stone circle in Ireland.

A beautifully-carved Pictish stone encased in a protective glass structure.

Bright, rebellious indigenous murals dating back to the Spanish Conquest inexplicably cover the walls of this Catholic church.

This immense scene of a cosmic battle between a jaguar and serpent illustrates the Aztec concept of the duality of life.

An archaeological museum at the Aztec pyramid displays signs of the New Fire ritual performed every 52 years.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

A sapling of the legendary tree where conquistador Hernán Cortés sat and wept after an Aztec uprising.

In this breathtaking canyon, crocodiles bask on boulders and glide through the murky waters.

The 19th-century hacienda house is filled with Aztec sculptures.